FetchRequest<Row>

A cursor over fetched rows.

let request: some FetchRequest<Row> = ...
let rows = try request.fetchCursor(db) // RowCursor
while let row = try rows.next() {  // Row
    let id: Int64 = row[0]
    let name: String = row[1]
}

Fetched rows are reused during the cursor iteration: don’t turn a row cursor into an array with Array(rows) or rows.filter { ... } since you would not get the distinct rows you expect. Use Row.fetchAll(...) instead.

For the same reason, make sure you make a copy whenever you extract a row for later use: row.copy().

If the database is modified during the cursor iteration, the remaining elements are undefined.

The cursor must be iterated in a protected dispatch queue.

An array of fetched rows.

let request: some FetchRequest<Row> = ...
let rows = try request.fetchAll(db)

A set of fetched rows.

let request: some FetchRequest<Row> = ...
let rows = try request.fetchSet(db)

The first fetched row.

let request: some FetchRequest<Row> = ...
let row = try request.fetchOne(db)